<html>
<head>
    <script type="text/javascript">
        function getCookie(c_name)
        {
            if (document.cookie.length>0)
            {
                c_start=document.cookie.indexOf(c_name + "=")
                if (c_start!=-1)
                {
                    c_start=c_start + c_name.length+1
                    c_end=document.cookie.indexOf(";",c_start)
                    if (c_end==-1) c_end=document.cookie.length
                    return unescape(document.cookie.substring(c_start,c_end))
                }
            }
            return ""
        }

        function setCookie(c_name,value,expiredays)
        {
            var exdate=new Date()
            exdate.setDate(exdate.getDate()+expiredays)
            document.cookie=c_name+ "=" +escape(value)+
                    ((expiredays==null) ? "" : ";expires="+exdate.toGMTString())
        }

        function checkCookie()
        {
            username=getCookie('username')
            if (username!=null && username!="")
            {alert('Welcome again '+username+'!')}
            else
            {
                username=prompt('Please enter your name:',"")
                if (username!=null && username!="")
                {
                    setCookie('username',username,365)
                }
            }
        }
    </script>
</head>

<body onLoad="checkCookie()">
</body>
</html>